Daustinhjr
New Member
I'm working on a buddies Bosch 940 es. As the title implies the water is going from really hot to cold over and over. This is my first time working on a tankless hot water heater; very limited experience with any water heater. Any advice is greatly appreciated.
This is what I've tried so far:
This is what I've tried so far:
- Checked all connections/fuses. *
- Checked to make sure vents weren't clogged
- Watched the flames while it was running. Looked uniform blue.
- Lowered the temp to 122.
- Pumped vinegar through it for 1 1/2 hours.
- Checked the flow at the tap and it checked out.
- Noticed one of the white blocks attached to the copper tubing had some burn marks on it. When I popped it off the copper for a closer look it broke in half like it was already fractured. After looking the part up in the manual I found it's part of the "freeze prevention kit". I ordered a replacement that will be here tomorrow. Is there any chance replacing this is going to fix the problem; or am I just replacing something that broke?